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https://github.com/mehcode/config-rs

⚙️ Layered configuration system for Rust applications (with strong support for 12-factor applications).
https://github.com/mehcode/config-rs

config config-management configuration configuration-management json rust toml

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⚙️ Layered configuration system for Rust applications (with strong support for 12-factor applications).

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# config-rs



![Rust](https://img.shields.io/badge/rust-stable-brightgreen.svg)

[![Build Status](https://travis-ci.org/mehcode/config-rs.svg?branch=master)](https://travis-ci.org/mehcode/config-rs)

[![Crates.io](https://img.shields.io/crates/d/config.svg)](https://crates.io/crates/config)

[![Docs.rs](https://docs.rs/config/badge.svg)](https://docs.rs/config)



> Layered configuration system for Rust applications (with strong support for [12-factor] applications).



[12-factor]: https://12factor.net/config



 - Set defaults

 - Set explicit values (to programmatically override)

 - Read from [JSON], [TOML], [YAML], [INI], [RON], [JSON5] files

 - Read from environment

 - Loosely typed — Configuration values may be read in any supported type, as long as there exists a reasonable conversion

 - Access nested fields using a formatted path — Uses a subset of JSONPath; currently supports the child ( `redis.port` ) and subscript operators ( `databases[0].name` )



[JSON]: https://github.com/serde-rs/json

[TOML]: https://github.com/toml-lang/toml

[YAML]: https://github.com/chyh1990/yaml-rust

[INI]: https://github.com/zonyitoo/rust-ini

[RON]: https://github.com/ron-rs/ron

[JSON5]: https://github.com/callum-oakley/json5-rs



Please note this library



 - can not be used to write changed configuration values back to the configuration file(s)!

 - Is case insensitive and all the keys are converted to lowercase internally



## Usage



```toml

[dependencies]

config = "0.13.1"

```



### Feature flags



 - `ini` - Adds support for reading INI files

 - `json` - Adds support for reading JSON files

 - `yaml` - Adds support for reading YAML files

 - `toml` - Adds support for reading TOML files

 - `ron` - Adds support for reading RON files

 - `json5` - Adds support for reading JSON5 files



### Support for custom formats



Library provides out of the box support for most renowned data formats such as JSON or Yaml. Nonetheless, it contains an extensibility point - a `Format` trait that, once implemented, allows seamless integration with library's APIs using custom, less popular or proprietary data formats.



See [custom_file_format](https://github.com/mehcode/config-rs/tree/master/examples/custom_file_format) example for more information.



### More



See the [documentation](https://docs.rs/config) or [examples](https://github.com/mehcode/config-rs/tree/master/examples) for

more usage information.



## MSRV



We currently support Rust 1.70.0 and newer.



## License



config-rs is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).



See LICENSE-APACHE and LICENSE-MIT for details.